Introduction: This study tested the feasibility of a home-based salivary cotinine test for the remote verification of smoking abstinence via a mobile-phone video call. Methods: Korean American women were recruited into a pilot smoking cessation study by advertising the study in online Korean American women's communities and offline Korean ethnic newspapers. Smoking abstinence was based on a combination of self-report and salivary cotinine test at post-quit 3-month follow-up. Those who self-reported smoking abstinence were invited to conduct a homebased salivary cotinine test using a NicAlert TM test strip. Research staff monitored the whole process of the test via a mobile-phone video call and read the result when it was ready. Results: At 3-month follow-up, 20 women (20/49, 40.8%) reported smoking abstinence. Of the 20, 16 (80.0%) performed the home-based salivary cotinine test; three refused the test; and one was excluded due to the use of nicotine patches. All but one yielded a level of 0 (cotinine concentration ≤ 10ng/ml) on the test strip, which indicates abstinence. The women who yielded a higher level than 0 or did not perform the test were all treated as smokers. Thus, the rate of biochemically verified smoking abstinence was 30.6% (15/49). Conclusion: There was a substantial difference (> 10.0%) between self-report and biochemical verification although the difference was not statistically significant. The verification seems to be crucial for the accurate assessment of smoking abstinence in Korean American women who tend to underreport use.
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